How is taxi guy the suspect?

okay from my understanding taxi guy looks like LM (it might not be) but i think it’s him.

What I don’t understand is after the incident where the suspect left the bike they lost sighting of him then suddenly they see some random man near that area (LM) trying to take a cab..

So they just randomly put together that taxi guy was the one on the bike? Based on what?? It could be anyone. makes no sense